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The difference between bracket [ ] and double bracket [[ ]] for accessing the elements of a list or
R provides two different methods for accessing the elements of a list or data.frame: [] and [[]] .
12 Answers
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Nginx url重写rewrite实例详解 - 更多技术 - 清泛网移动版 - 专注C/C++及内核技术
...助。nginx rewrite 实现二级域名跳转
当访问http://www.jbyuan.com跳转到http://www.jbyuan.com/nvxingjiankang/
方法一：
这种方法浏览器地址会变www.jbyuan.com/nvxingjiankang/
实现访问如下：
server {
listen 80;
server_name www.test.com;
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How do you read from stdin?
I'm trying to do some of the code golf challenges, but they all require the input to be taken from stdin . How do I get that in Python?
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Python (and Python C API): __new__ versus __init__
The question I'm about to ask seems to be a duplicate of Python's use of __new__ and __init__? , but regardless, it's still unclear to me exactly what the practical difference between __new__ and __init__ is.
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How to implement a queue with three stacks?
I came across this question in an algorithms book ( Algorithms, 4th Edition by Robert Sedgewick and Kevin Wayne).
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What is the Python equivalent of static variables inside a function?
What is the idiomatic Python equivalent of this C/C++ code?
26 Answers
26
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CSS3 Rotate Animation
Cannot get this animated image to work, it is supposed to do a 360 degrees rotation.
6 Answers
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Fastest way to check if a value exists in a list
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Why does the order of the loops affect performance when iterating over a 2D array?
Below are two programs that are almost identical except that I switched the i and j variables around. They both run in different amounts of time. Could someone explain why this happens?
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What are the differences between numpy arrays and matrices? Which one should I use?
What are the advantages and disadvantages of each?
5 Answers
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